curl --request GET \
  --url https://api.heygen.com/v3/brand-kits \
  --header 'x-api-key: <api-key>'

{
  "data": [
    {
      "brand_kit_id": "<string>",
      "name": "<string>",
      "logo_url": "<string>",
      "colors": [
        "<string>"
      ]
    }
  ],
  "has_more": true,
  "next_token": "<string>"
}